Good source of info on tubes?
I have a Jolida 1501RC with GE 5751 low noise tubes. I put those in because Brendan at TubeWorld recommended them. (I didn't like the highs of the original tubes). They've been great but it's time to replace them.
I'm interested in learning more about the tubes that would be good for this amp. Specifically, I'd like to learn the differences between the 5751 tubes like the years, double/triple mica(??), gray/black(??). I don't know what any of this means.
Right now I'm looking at these at TubeWorld just because they are a decent price: Low Noise Pairs 5751 GE gray plates NOS double mica 1970's white printing original boxes
2.87/3.15 and 3.0/3.0ma.
By paying more for other tubes, am I getting a better sound? or just different?
Sorry about all the questions...